| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.89 |
| Score | 0% | 58% |
-40°F is how many °C?
\(-{40 \over 9}\) |
|
\({40 \over 9}\) |
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-40 |
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-8 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (-40 - 32)\)
\(C° = {5 \over 9} (-72) = {{-72 \times 5} \over 9}\)
\(C° = {-360 \over 9}\)
\(C° = -40\)
Which of the following is true about species groups?
an ecosystem is a biological population |
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a community is made up of a group of populations |
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a biome is a made up of a group of biospheres |
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a population is made up of a group of communities |
A population is a group of organisms of the same species who live in the same area at the same time. A community is a group of populations living and interacting with each other in an area.
A major difference between sound waves and light waves is which of the following?
a sound wave is much slower than a light wave |
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a sound wave is mechanical while a light wave is electromagnetic |
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all of these are correct |
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a sound wave cannot travel through a vacuum |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.
Gametes have how many pairs of chromosomes?
2 |
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23 |
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4 |
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46 |
Reproductive (haploid) cells known as gametes have half as many (23) pairs of chromosomes as normal (diploid) cells. When the male gamete (sperm) combines with the female gamete (ovum) through meiosis to form a zygote, each gamete supplies half the chromosomes needed to form the normal diploid cells.
What part of the nervous system controls simple reflexes?
spinal cord |
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autonomic |
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cerebrum |
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medulla |
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.